Includes a cool round tool that wasn't included in the original Roomba to clean the large round brush. I think I used it a little wrong because I kind of broke it (it cracked) the first two weeks, but basically it still works great for cleaning the brush, which is great because I I have a Newfoundland dog that is always full and I want it! I'd recommend paying attention that if you use the round tool to keep track of the little strips of rubber between the bristles I may have accidentally ripped off a few that way.